Rock drill



Dec. 29, 1942. c. F. osGooD Y 2,306,465

iocx DRILL 'Filed Dec. 26, 1941 s sheets-sheen 1- l Dec. 29, 1942. c.y F. ossoon ROCK DRILL Filed Dec. 26, 1941 I5 Sheets-Sheet 2 1 MQ E ww.. Eig

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C. F. OSGOOD ROCK DRILL' Filed Dec. 26, 1941 l3 sheets-sheen s b lill! Aff Patented Dee. 29, 14942 ROCK DRILL Charles F. Osgood, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application December 26, 1941, Serial No. 424,426 y 17 claims. (c1. Z55- 45) and advantages of the invention willhereinafter This invention relates to roclcdrills, and more particularly to improvements in the fluid conducting means of a hammer rock drill of the mounted drifter type.

In hammer rock drills of the mounted drifter type, it is now common practice to effect feed of the fluid actuated hammer motor along the guideways of a guide shell by means of a feed I lscrew journaled on the guide shell and a 'coacting feednut xed to the drill hammer motor. The feed screw is commonly driven by an. independent uid ,actuated feeding motor supported at the rear end of the guide shell wholly independently of the drill hammer motor. With such an arrangement, it has been necessary to provide a fluid supply hose connection for the feeding motor in addition to the fluid supply hose for the drill hammer motor. This separate fluid supply` hose for .the feeding motor hangs down along one side of the drill and is extremely objectionable since it notonly becomes entangled, but also due to its exposed location, frequently breaks resulting in a'temporary shut-down of the drill.

An object of the present invention is to provide in a rock drill of the above character a novel construction which completely eliminates the separate fluid supply hose connection for the feeding motor thereby, to a large extent, overcoming the disadvantages of previous known devices. Another object is to provide in a mounted drifter type rock drill a self-adjusting fluidsupappear. f Y

In `the accompanying drawings, in which two illustrative embodiments ,of the invention are ShOWnZ j n Fig. 1 is a view partially in side elevation and partially in longitudinal vertical section taken through a hammer rock drill in which the preferred illustrative embodiment of the invention is incorporated. Y

Fig. 2 is an enlarged cross sectional view taken substantially on line 2-2 of Fig. l. n

Fig. 3 is a detail View in longitudinal vertical section taken substantially on line 3-3 of Fig. 2.

Fig. 4 is an enlarged cross sectional view taken substantially on line 4-4 of Fig. 1.

Fig. 5 is a View in longitudinal Vertical section taken substantially ,on line 5 5 of Fig. 4.

Fig. 6 is a detail cross sectional view taken substantially on line 6 6 of Fig. 5.

Fig. 7 is a horizontal sectional view taken substantially on line'l--lof Figs. 1 and 2.

Fig. 8 is an enlargedV cross sectional view taken substantially on line 8-8 of Fig. 1.

Fig. 9 is an enlarged View taken on line 9--9 of Fig. l. A

Fig.Y 10 is a view similar to Fig. 1 showing another embodiment of .the invention.

Fig. 11 is an enlarged cross sectional .view taken substantially on line lI-ll of Fig. 10.

. .Fig. 12 is a view in longitudinal vertical section Y taken substantially on line I2-l2 of Fig. 11.

ply Yconnection extending longitudinally within n Fig. 13 is an enlarged cross sectional view taken substantially Aon line I3-l3 of Fig. 1.

In both illustrative embodiments of the invention, the improved self-adjusting fluid supply connection is embodied in a hammer rock drill of the mounted drifter type, although itwill be evident that features of the invention may be embodied in rock drills of other types.

The hammer rock drill comprises a conven- I tional drilling hammer motor I mounted to slide rock-drill having an independent-feeding motor mounted at the rear endof the guide shell and provided'with a fluid Vsupply to the feed motor which is conducted through an element of a drill I ment and combinationof parts. Other objects along the guideways of a guide shell 2'. The hammer motor includes a motor cylinder 3 lcontaining a reciprocable hammer piston for percussively actuating a drill steel 4, the latter being suitably mounted within a front 'chuck housing 5 secured to the motor cylinder. The motor cylinder is provided with` a usual back head 6 carrying a throttle valve mechanisml for controlling the supply of pressure fluid from a supply hose connection 8 to the motor cylinder. Journaled Von the guide shell is ka power driven feed screv.-1

9 which coacts with a non-rotatable feed nut lilk (Figs. Y1 and 3), suitably secured,Y to the hammer motor cylinder. The back head has an opening, rearwardly of the feed nut in alinement therewith, through which the feed screw passes, as shown in Fig. 2. A reversible fluid actuated feeding motor Ii, which may ybe of a conventional design, is mounted in the rear end of the guide shell and has its power shaft operatively connected to the feed screw.

According to the present invention, the back head of the motor cylinder has a laterally located boss I2 projecting Within the guide shell and provided with a bore I3 in which is fixed a cylindric tube I4, the latter having its forward end closed bya plug I5. This tube extends longitudinally within the guide shell so as to be protected thereby, in the manner illustrated, and is supported at its forward end within a boss I2 integral with the motor cylinder. Telescopically arranged with respect to this tube is a smaller intermediate tube I6 which, in turn, has telescopic relation with an inner tube I'I. The tubes I4 and I3 carry suitable packings I8 and I9 so as to reduce leal;- age to a minimum. To prevent axial separation of the tubes I4 and I6, the latter has an enlarged front end portion I6', and the inner tube I'I` may, if desired, be provided with a similar enlarged front end portion to prevent axial separation thereof from the tube I6. Leading from the supply chamber Zi) (Fig. 2) of the throttle valve mechanism 'I is a passage 2I connected to groove 22 in turn connected through radial. ports 23 to the interior of the outer tube I4. The interior of this outer tube I4 has communication through the telescopic tubes I8, I9 with a passage 25 leading to a valve mechanism 26 which controls the flow of pressure fluid to the feeding motor. The inner tube I'I has a gland connection at 2l mounted on the casing of the feeding motor II, and this gland connection permits a limited amount of lateral movement of the tube thereby to prevent the breaking off of the tube in the even-t the parts are, for any reason, out of exact alinernent. This freedom of the lateral movement of the inner tube with respect to the casing of the feed motor also compensates for the vibrations set up within the drill during its operation. The rear flange of the inner tube has a fluid tight seal with the gland plug,`and the tube flangemay be held in position either by pressure fluid or the coiled spring shown. Due to the particular arrangement of the telescopically arranged tubes longitudinally within the guide shell, an extremely compact structure not only results, but also the tubes are protected to 'a large extent by the guide shell.

Itis accordingly evident that when fluid under pressure is supplied to the supply hose 8 of the drill hammer motor I, there is a concurrent flow of pressure fluid through passage 2I, groove 22, ports 23, through the telescopically arranged tubes I4, I6 and I'I and to passage 25 leading to the control valve mechanism 2S of the feeding motor I I.

The front end of the feed screw 9 is journalled in a bearing bracket 2B (Figs. l8 and 9) suitably attached as by bolts 29 to the front endof the guide shell, and this bracket is so shaped. and constructed as to permit the forward portion of the outer cylindric tube I4 to project longitudinally along one side thereof when the drill hammer motor is located in a position near its foremost limit of travel on the guide shell.y

The throttle valve mechanism` 'I controls the flow of pressure fluid from the supply connection 8 to the hammer motor cylinder 3, and the supply of pressure fluid to the feed motor II is controlled by the valve mechanism 25. By reversing the feeding motor II, the drill hammer motor I may be fed in the reverse direction along the -shell guideways.

In the embodiment of the `invention shown in Figs. 10 to 13, inclusive, a fluid supply connection 30 is mounted on 4the casing of the feeding motor II instead of on Athe drill hammer motor I and the supply of pressure fluid to the hammer motor is conducted through the telescopically arranged tubes I4, I6 and I1. In this instance, the supply chamber 3I of the feed motor control valve mechanism 26 has communication with the supply hose 33, and this chamber is connected by a passage 32 (Fig. 12) to the gland connection 21 for the inner `tube I'I. The interior of the tube I4 is connected through radial ports 33, groove 34 and passage 35 (Fig. 13) to the supply chamber 2li of the throttle valve mechanism 1. This arrangement enables the positioning of the supply hose for both the feeding motor and the drill hammer motor at therear end of the guideshell. In this embodiment of the invention, the telescopic tube arrangement is the same as that described above, although, in this instance, fluid flow through tubes occurs in a reverse direction, i. e. from the feeding motor to the drill hammer motor. As in the form. of the invention above described, the flow of pressure lfluid to the'drill hammer motor may be controlled by the throttle valve mechanism 1.

As a result of this invention, an improved fluid supply arrangement is provided for a mounted rock drill of the independent'feed motor type, wherein the separate supply hose forfthe feed motor is completely eliminated. It will further be evident that by arranging the telescopically arranged fluid conducting tubes longitudinally within the guide shell, the. arrangement is not only extremely compact, but also the supply tubes are to a great extent protected by the 'shell Other advantages of the invention will be' clearly apparent to those skilled in theart.

While I have in this application specifically described two embodimentsl-which the invention may assume in practice, itwillbe understood that these embodiments -of the same 'areshown for purposes of illustration and'that the invention may be modif-led andincorporatedA in various other ,embodiments without departing from its' 'spirit or the scope of the `appended claims.

What I claim as new and desire to' secureby Letters Patent is: f

1. In a rock'drill, a guide shell, a Vfluid actuated hammer motor guided onV Said shell,"mea`ns for feeding Vsaid hammer motor alongthe shell guideways includinga fluid actuated feeding motor mounted onsaidV shell independently offsaid hammer motor, saidhammer. motor being movable relative to said feeding vmotor duringthe feeding operation,and means forN supplying fluid under pressure to said hammerrmotor `said feeding motor, the fluid supply means for one of said motors including self-adjusting. fluid supply connections extending longitudinally within said guide shell intermediate,said'motors.

2. In a rock'drill,` aguideshell;afluidactuated hammer motor guidedon said 'shell, means for Vfeeding said hammer Vmotor along. the shell guideways including a fluid actuated feeding moy tor mounted on saidshell independentlyof, said ham-mer"44 motor, said hammermtorbei'ng mov-- able relative to said feeding motor during the fluid under pressure to said hammer motor and said feeding motor, said fluid supply means to one of said motors including self-adjusting fluid supply connections extending longitudinally within the guide shell, said supply connections `including a fluid conducting element movable relative to said shell with said hammer motor..v

4. In a rock drill, a guide shell, a fluid actuated hammermotor guided on said shell, means forfeedng said hammer motor along the shell guideways including a fluid actuated feeding motor mounted in a stationary position at the rear end of said guide shell, and means for supplying fluid under pressure to said hammer motor and said feeding motor, said fluid supply means to said feeding motor including self-adjusting fluid supply connections extending longitudinally Within the guide shell, said supply connections 1 including a fluid conducting element movable relative to said shell with said hammermotor.

5.`In a rock drill, a guide shell, a fluid actuated hammer lmotor guided on said shell, means for feeding said hammer motor along the shell guideways including a fluid actuated feeding motor mounted on said shell independently of said hammer motor and relative to which the latter is movable during the feeding operation, said feeding means also including a feed screw journaled on said guide shell and driven by said feed-V ing motor, and means for supplying fluid under pressure to said hammer motor and said feeding motor, said fluid supply means for one of said motors including self-adjusting fluid supply connections. extending longitudinally within the guide shell in parallelism with and along one side of said feed screw.

6. In a rock drill, a guide shell, a fluid actuated hammer motor guided on said shell, means for feeding said hammer motor along the shell tubes extending longitudinally within said guide shell, one of said/tubes being movable relative to said shell with said hammer motor.

K8, Ina rock, drill, a guide shell, a fluid actuated hammer motor guided on said shell, means forfeedingu said hammer motor along the shell guidewaysincluding a feeding motor mounted in a stationary position at the rear end .of said guide shell and relative .to which said hammer motor is movable during the feeding operation, and meansrfor supplying fluid under pressure to said ,hammerk motor and said feeding motor, said fluid supply means for said feeding motor including telescopically arranged fluid conducting tubes extending longitudinally within said guide shell, one of said tubes being movable relative to said shell with said hammer motor.

9. In arock drill, a guide shell, a fluid actuated hammer motorrguided on said shell, means for feeding saidhammer motor along the shell guideways including a fluid actuated feeding motor mounted on said shell independently of said hammermbtonfsaid hammer motor Abeing guideways including a fluid actuated feeding motor mounted on said shell independently of said hammer motor and relative to which the latter is movable during the feeding operation, said feeding means also including a feed screw journaled on saidA guide shell and driven by said feeding motor, and means for supplying fluid under pressure to said hammer motor and saidk feeding motor, said fluid supply means for said feeding motor including self-adjusting fluid supply connections extending longitudinally within the guide shell in parallelism with and along one side of said feed screw.

7. In a rock drill, a guide shell, a fluid actuated hammer motor guided on said shell, means for feeding said hammer motor along the shell guideways including a feeding motor mounted in a stationary position at the rear end of said guide shell and relative to which said hammer motor is movable during the feeding operation, and means for supplying fluid under pressure to said hammer motor and said feeding motor, said fluid supply means for one of said motors including telescopically arranged fluid conducting movable relative to said feeding motor during the feeding operation, rand means for supplying fluid under pressure to said hammerv motor and said feeding motor, the fluid supply means for said hammer motor including self-adjusting fluid supply connections. extending longitudinally within'said guide shell, said supply' connections including va fluid c onducting velement connected to said feeding motor and relative to which said hammer mo-tor is movable.

10. In a rock drill, a guide shell, a fluid actuated hammer motor guided on said shell, means for feeding said hammer motor along the shell guideways including a fluid actuated feeding motor mounted in a stationary position at the real'` end of saidY guide shell, and means for supplying fluidunder pressure to said hammer motor and said feeding motor, said fluid supply means to said hammer motor including self-adjusting fluid supply connections extending longitudinally Within the guide shell, said supply connections including a fluid conducting element remaining stationary with said feeding motor during feeding movement of said hammer motor relative to said shell.

l1. In a rock drill, a guide shell, a fluid actuated hammer motor guided on said shell, means for feeding said hammer motor along the shell guideways including a fluid actuated feeding motor mounted on said shell independently of said hammer motor and relative to which the latter is movable during the feeding operation, said feeding means also including a feed screw journaled on said guide shell and driven by said feeding motor, and means for supplying fluid under pressure to said hammer motor and said feeding motor, said fluid supply means for said hammer motor including self-adjusting fluid supply connections extending longitudinally within the guide shell in parallelism with and along one side of said feed screw.

12. In a rock drill, a guide shell, a fluid actuated hammer motor guided on said shell, means for feeding said hammer motor along the shell guideways including a feeding motor mounted in a stationary position at the rearend of said guide shell and relative to which said hammer motor is movable during the feeding operation, and means for supplying fluid under pressure to said hammer motor and said feeding motor, said fluid supply means for said hammer motor including telescopically arranged fluid conducting tubes extending- 'longitudinally"withinl said guide shellminte'rmediate sa-idinot'rs. u Y f 13.` In a rock drill, a guide shellfa ud actuated 'hammer motor Aguided on saidshell, means f or feed-ing said 'hammer 'l motor along the* shell guideways including la v`fluid actuated feeding motor mounted o n said shell independently'of said hammer motor, said-hammermotor `being movable relative to said-feeding'motor during the feeding operation, and meansfor^ sup1t1l`ying iiuid underY pressu're'to said hammer motor and said feeding motora'nd a fluid supply Vconnection operatively Yassociated with one of said `motors for supplying'pressure fluid to both'motors, the

fluid supplyy means for one'of said Ymotors inmotor 'mounted on said shell independently of l said hammer motor,'said hammer motor being movable relative vto said feeding motor during the feeding operation, and means'for supplying fluid under pressure to said hammer motor 'and said feeding motor, the fluid supply means for saidV feeding vmotor including self-adjusting fluid supply connections extending `longitudinally Within said guide shell `intermediate said motors and a fiuid supply connection operatively associated with said hammer motor for supplying fiuid to both of said motors.

15. In a rock' drill, a' guide shell, a fluid actuated hammer motor guidedA on said shell, means for feeding said hammer motorA along the shell guideways including a fluid actuated feeding motor mounted on said shell independently of said hammer motor, said hammer Vmotor being isomers movable lrelative 15o-"said feeding l motor 'during thefding' operation, 'and 'nieans for supplying uid under-pressure to said hammer motor 'and said feeding motor, the fluidVsupply meansA for Said hammer Nmotor including 'self-adjusting fluid supply connections Yextending longitudinally within lsaid guide shell intermediate said m'otors and a yfluid supply connection operatively assoeiatedwith saidV feeding motor for lsupplying fluid -to l' both of 'said motors.

1.6.-In arock 'd'rlLaguid'e shell, a fluid actuated'hammer `motor guided on said shell, means for feeding said-hammer motor along the shell guidways includinga -fluid 4actuated feeding motor mounted non 'saidshellv independently Vof said fharr'inerv motor', isaidhammer Y motorv being movabl'erelative to said feeding motor during Vthe feeding operation,` and means for: supplying? fiuld under pressure to y'said hammer motor and said feeding motorgtheuid supplymean's #for one of said motorsdncludfing'self-adjusting -uid supply connections -extending @longitudinally -of said guide shell "inte'zrne'diate said-r motors.

'17111; a-rck drill, ar'gulde shell,- a vfluid actu atedlia-mrner motor guidedon 'said shell,` means forf feedir'i'gsaid;hammer4 motor along the shell guideways (including va -fee'ding motor `mounted inrak stationary position at one end of said guide shell and Yrelative vtofwhieh saidfham'm'er motor is "mnvable during thewfeeding operation, and means for'supplying fluid underpressureto said hammermotor and 'said lfeeding vmotor, Vsaid fluid supply means *for one-'ofsaid-'mo'tors including "telescopically-"arranged fluid- Yconducting tubes vrextending longitudinally vof said guideshell, one" of said tubes-'remaining stationarywith'said feeding 'motor'fand another moving vwith said hammer motor duringjthe feeding operation.

CHARLES/F. OSGOOD.

CERTIFICATE 0R CORRECTION. Patent No. 2,506,LL65. December 29, 19kg.

CHARLES E. osCooD.

It s hereby certified that error appears imy the printed specification of the above numbered patent requiring correction as follows: Page 2, first 0011.111111,` line 5h., forl8,l9" read l6,l(-; and that the said Letters Patent, should be read with this correction therein that the same may Conform to the record of the case in the PatentOfice.

signed and sealed this Lith day of May, A. D'. 19M.

Hem-5r Van `Arsdale, (Seal) I Acting Commissioner of Patents.v 

